Briggs & Stratton 84004416 Fuel Cap

What It Is

The Briggs & Stratton 84004416 Fuel Cap is a replacement vented cap for Briggs & Stratton engines used on walk-behind mowers, riding mowers, and some pressure washers. It fits a standard 2-inch threaded fuel tank opening.

Fitment & Compatibility

Before buying, confirm your engine model number (found on the valve cover or blower housing) and check that your fuel tank neck has a 2-inch outer diameter with internal threads. This cap is OEM replacement for Briggs engines including Vanguard, Intek, and Classic series. It will not fit most Honda, Kohler, or Kawasaki engines—verify your tank neck is 2 inches. If your cap is non-vented (solid plastic with no air hole), this vented cap may cause fuel spillage on hot days. Measure your old cap’s diameter and thread pitch if possible.

Key Things to Know

• Vented design: This cap has a small vent to equalize tank pressure. If your engine requires a non-vented cap, use a different part (e.g., 84004415).
• Installation is simple: No tools needed—just hand-tighten until snug. Overtightening can crack the cap.
• Quality note: Some users report the vent can clog over time with debris or ethanol residue. Clean with compressed air if mower starts running rough.
• Common gotcha: The cap is not universal—check your tank’s thread direction (righty-tighty). A few older Briggs models use a left-hand thread.

Should You Buy It

If you need a direct-fit, vented replacement for a 2-inch threaded Briggs & Stratton fuel tank and your original cap is cracked, missing, or leaking, this is the right part. It’s overpriced for what it is, but it’s the correct OEM match and avoids compatibility headaches. Skip it if your engine requires a non-vented cap or you’re retrofitting onto a non-Briggs tank.